[cairo] ImageSurface from a Pattern

[Donn]

Hello there Uli,
I'm not a native C ninja, so I spent an hour writing the attached to 
show you where my head's at.

In Vala I'm having trouble moving from a "Surface" to an "ImageSurface", 
however I know Vala is not your bag, so leave that aside.

In the C, my intent is:
1. Draw a 100px rectangle.
2. Set is as a clip - so that the size will be 100px (IIUC what you 
explained.)
3. pop_group into pat var.
4. Get the surface of that pat.
5. Get the width of that surface (i.e. 100px)

The code is giving me 400px - the size of the initial cr surface.

Where did I up-screw? :D

\d

Once again, I really appreciate your help on my annual Cairo holidays.
:)
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